I just bought 2 Occidozyga lima and have them with a short-finned male betta in a 2.5g. They are not fully aquatic like ADFs. I was told they only get to be 1.5".
I lowered the water level about 2 - 3 inches, stood a couple small pieces of bogwood up so they stick out of the water, and floated hornworth and duckweed on the surface.
They are great jumpers. One of mine jumped in the garbage can at the store.
Here's a pic (not my pic):
http/www.wildherps.com/species/O.lima.html
Aloaring- I know you asked about ADFs, but I had to tell someone, I figured it might as well be you, since I havn't talked to you in a while.
PS- I hope the new tank is going well.